d09e79cb1c
We used to complain that we cannot merge anything we fetched with a local branch that does not exist yet. Just treat the case as a natural extension of fast forwarding and make the local branch'es tip point at the same commit we just fetched. After all an empty repository without an initial commit is an ancestor of any commit. [jc: I added a trivial test. We've become sloppy but we should stick to the discipline of covering new behaviour with new tests. ] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
120 lines
2.9 KiB
Bash
Executable File
120 lines
2.9 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2005 Junio C Hamano
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#
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# Fetch one or more remote refs and merge it/them into the current HEAD.
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USAGE='[-n | --no-summary] [--no-commit] [-s strategy]... [<fetch-options>] <repo> <head>...'
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LONG_USAGE='Fetch one or more remote refs and merge it/them into the current HEAD.'
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. git-sh-setup
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strategy_args= no_summary= no_commit= squash=
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while case "$#,$1" in 0) break ;; *,-*) ;; *) break ;; esac
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do
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case "$1" in
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-n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
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--no-summa|--no-summar|--no-summary)
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no_summary=-n ;;
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--no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
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no_commit=--no-commit ;;
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--sq|--squ|--squa|--squas|--squash)
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squash=--squash ;;
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-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
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--strateg=*|--strategy=*|\
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-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
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case "$#,$1" in
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*,*=*)
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strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
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1,*)
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usage ;;
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*)
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strategy="$2"
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shift ;;
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esac
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strategy_args="${strategy_args}-s $strategy "
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;;
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-h|--h|--he|--hel|--help)
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usage
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;;
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-*)
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# Pass thru anything that is meant for fetch.
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break
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;;
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esac
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shift
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done
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orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
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git-fetch --update-head-ok --reflog-action=pull "$@" || exit 1
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curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
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if test "$curr_head" != "$orig_head"
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then
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# The fetch involved updating the current branch.
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# The working tree and the index file is still based on the
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# $orig_head commit, but we are merging into $curr_head.
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# First update the working tree to match $curr_head.
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echo >&2 "Warning: fetch updated the current branch head."
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echo >&2 "Warning: fast forwarding your working tree from"
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echo >&2 "Warning: commit $orig_head."
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git-update-index --refresh 2>/dev/null
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git-read-tree -u -m "$orig_head" "$curr_head" ||
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die 'Cannot fast-forward your working tree.
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After making sure that you saved anything precious from
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$ git diff '$orig_head'
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output, run
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$ git reset --hard
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to recover.'
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fi
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merge_head=$(sed -e '/ not-for-merge /d' \
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-e 's/ .*//' "$GIT_DIR"/FETCH_HEAD | \
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tr '\012' ' ')
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case "$merge_head" in
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'')
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echo >&2 "No changes."
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exit 0
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;;
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?*' '?*)
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if test -z "$orig_head"
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then
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echo >&2 "Cannot merge multiple branches into empty head"
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exit 1
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fi
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var=`git-repo-config --get pull.octopus`
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if test -n "$var"
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then
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strategy_default_args="-s $var"
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fi
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;;
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*)
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var=`git-repo-config --get pull.twohead`
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if test -n "$var"
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then
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strategy_default_args="-s $var"
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fi
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;;
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esac
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if test -z "$orig_head"
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then
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git-update-ref -m "initial pull" HEAD $merge_head "" &&
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git-read-tree --reset -u HEAD || exit 1
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exit
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fi
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case "$strategy_args" in
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'')
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strategy_args=$strategy_default_args
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;;
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esac
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merge_name=$(git-fmt-merge-msg <"$GIT_DIR/FETCH_HEAD") || exit
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git-merge "--reflog-action=pull $*" \
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$no_summary $no_commit $squash $strategy_args \
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"$merge_name" HEAD $merge_head
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